[Nouveau] [Bug 90306] Nouveau crashes with multiple monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90306

--- Comment #3 from Lars Seipel <lars.seipel at gmail.com> ---
I'm seeing the same symptoms on my machine. For me, the issue gets triggered by
a kernel update. 4.0 (with or without stable patches on top of that) works.
When running one of the 4.1 RCs the X server crashes on xrandr(1) (to enable
multi-monitor), printing the above symbol lookup error message to the console.

The attached log gives some hints as to why that might happen:
[    80.374] (EE) NOUVEAU(0): Failed to initialise context object: M2MF_NVC0
(0)
[    80.374] (EE) NOUVEAU(0): Error initialising acceleration.  Falling back to
NoAccel
[    80.374] (**) NOUVEAU(0): [COPY] acceleration disabled

So it's not necessarily that the original reporter is using GLAMOR, it might
also be the case that acceleration isn't enabled at all.

Any idea on what's causing this? I can try to pin down the earliest failing
commit but it'll take some time until I get to it.

Should I file a new report? OP doesn't state anything regarding kernel version,
so the issues might or might not be related.

Versions used:
xorg-server 1.17.1
libdrm 2.4.61
xf86-video-nouveau 1.0.11
kernel v4.1-rc3-284-g92752b5 (i.e. Linus' current tree as of now)

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